A bicyclist was killed after being stuck by a vehicle and thrown from the Sanibel Causeway on Saturday morning.More >>

LEE COUNTY, Fla. -

The woman who hit and killed a woman riding her bike on the Sanibel Causeway pleaded no contest to failing to maintain her lane. She received the maximum penalty – the loss of her license for six months.

Theresa Shirley was driving on the Sanibel Causeway in May 2011 when she swerved out of her lane and knocked Tracey Kleinpell off the bridge and into the water. She died at the scene.

The State Attorney's Office said they could not file criminal charges in this case because toxicology reports could not show prescription drugs found in Shirley's system caused her to fall asleep at the wheel.

Shirley and her attorney had no comment.

Shirley pleaded no contest to failure to maintain her lane. She received the maximum penalty.

Shirley was fined $1,000, lost her license for six months, must perform 120 hours of community service and attend a day long trauma class.

An attorney for Kleinpell's husband says he was prepared for sentence today.

"He's very upset. Obviously, he had hoped that the state would have prosecuted a felony, and he's obviously disappointed. But he knew that this was going to be the result when the state refused to prosecute a felony case," said attorney Allan Parvey.